Hertel 74131277 Drill Bit Letter P Cobalt 135 Deg

Product Description

The HERTEL 74131277 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metal fabrication and machining applications. Sized at Letter P (0.3230 inches decimal equivalent), this bit features a 135-degree split point that reduces walking and minimizes the need for a center punch on flat stock. Constructed from cobalt high-speed steel (HSCO), it handles harder workpiece materials and elevated cutting temperatures better than standard HSS tooling. The web-thinned parallel web configuration reduces thrust load and improves chip evacuation. Overall length is 2-15/16 inches with a 1-11/16 inch flute length.

This drill bit is suited for use in CNC machining centers, drill presses, and hand-held power tools where a shorter, stiffer stub-length bit is preferred to reduce deflection. The right-hand cutting direction and regular spiral flute geometry make it a standard choice for production drilling in steel, stainless steel, cast iron, and other ferrous materials. It is appropriate for machinists, tool and die technicians, and maintenance mechanics working in industrial and commercial settings.

Key Features

• Letter P size (0.3230 inches) screw machine stub length for reduced deflection
• 135-degree split point reduces thrust and eliminates center-punch requirement on most flat stock
• Cobalt HSS construction for improved heat and wear resistance in ferrous materials
• Web-thinned parallel web reduces cutting resistance and improves chip flow
• 2-flute regular spiral flute design for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a standard screw machine length drill bit fitting any drill chuck or collet accepting a straight cylindrical shank in the 0.3000 to 0.3500 inch size range.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or maintenance technician familiar with rotating cutting tool safety. Ensure the workpiece is securely clamped and the chuck is fully tightened before operation. Do not exceed the recommended RPM range for the workpiece material and bit diameter. Inspect the cutting edges for wear or chipping before each use and replace if the split point shows signs of dulling.